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What are current views on twisted tube heat exchanger configurations in refineries, particularly in comparison with conventional shell and tube configurations?
 
Answers
14/08/2014 A: Louis B-C, Eddyfi, lbc@eddyfi.com
Inspecting Twisted Tubes used to be a huge challenge (if at all possible) but it is now business as usual. Traditional Non-Destructive Testing (NDT) examinations that used standard eddy current probes could not provide reliable data and defects could go undetected. Eddyfi has developed a specific probe that can detect, locate and precisely size flaws in Twisted Tubes. Owners will have an easier time extending the useful life with the high-quality results of the only solution capable of giving reliable results. See www.eddyfi.com for more info! Hope this helps.
13/12/2012 A: Ricardo Correia, Portugal, jrmc1977@gmail.com
My experience is don't accept twisted tubes, only if is profitable to change the bundle every 4 years. Instead use helix exchanger
27/10/2011 A: Fabrizio Palmeri, Alfa Laval, fabrizio.palmeri@alfalaval.com
I believe that - in addition to Twisted Tubes - it could be convenient (and it's done within Refineries, more and more) to check Compabloc Welded HX as an alternative to S&T. Today Compablocs are used in almost all the main refinery processes -starting from Crude preheatings in ADUs. Check out some detailed information and references on www.alfalaval.com/refinery.
19/09/2011 A: Abraham Emamnuelxp, JC Equipments Pvt Ltd, emmanuelxp@gmail.com
You See this Ref Link: Cooling Towers Manufacturer
15/08/2011 A: Alan Goelzer, Jacobs Consultancy, alan.goelzer@jacobs.com
Personally, I favor Koch Twisted Tube Technology exchangers for more challenging heat exchange services, like hot crude oil versus viscous hot vacuum residue and for services where high thermal coefficients and mitigated fouling are attractive. The incremental cost of Koch Twisted Tube Technology Exchangers and requirement to use 0.5 inch hydraulic cleaning probes and strong preference to employ hydraulic bundle extractors for loading and unloading of the bundles mean that 'cheapest possible first cost' likely will go to conventional S&T exchanger alternative with lesser performance and greater fouling
13/08/2011 A: J ROUT, IPESS, jrout86@gmail.com
1. Twisted Tube Heat Exchangers typically have 40% higher heat transfer coefficient for same pressure dop as conventional shell & tube type.
2. Twisted tubes are self supporting, so baffles are not required.
3. Less vibration as tubes are supported at multiple contact points.
4. Better turbulens, no dead spots, so reduced fouling.
10/08/2011 A: Mike Watson, Tube Tech International Ltd, mike.watson@tubetech.com
1. a lot better heat transfer area
2. better if product does not foul up shell and tube side
3. Cleaning used to be a problem until Tube Tech developed a patented method to mechanically clean both SHELL and TUBE side. see: http://www.tubetech.com/case-studies/refineries-case-studies/twisted-tube-heat-exchanger-returned-to-bare-metal